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o deck with a flat top piston will be too much compression for pump gas 91 octane, will need to be around 9.2:1 J heads with 2.02 valves



I built 1 for a friend and it is 10.3-1 with aluminum heads and is doing fine on 91

You really need to know the chamber size of the heads you are going to use before you know for sure what your final comp ratio will be.



The chamber size are 65cc

New best 10.18 , 1.40 60 ft 496 Scott Brown built, street driven 3600 lbs,654 hp , 653 ft tq